#include <iostream>
using namespace std;
namespace 
{
int NUM=10;
void print(){
    cout<<"hello world\n"<<endl;    
}
}//end of name 
int NUM2 =20;
int main()
{
    cout << ::NUM<<endl;
    cout << ::NUM2 <<endl;
    cout << "Hello world" << endl;
    return 0;
}


